Looking good, though a thought came to mind when you swapped your valve cover to accommodate the catch can / breather on the driver's side. What do you have planned for the passenger side of the firewall? I see a lot of smooth wide open real estate there. I do realize you have a down pipe from the turbo that will be running through that side. My thoughts are that from what I am seeing right now (in my possibly limited perspective of your full vision) is a bit of clutter gathering on the driver's side now, with the brake assist unit and master cylinder and catch can all grouped together. Once you also add a wiper motor assembly into that area, it's going to get even more occupied. Might the passenger side of the firewall be a better place to hang the catch can / breather, which will add some symmetry to the engine compartment appearance, then also saving you from having to obtain another valve cover? I believe it would be also easier to drain on the passenger side of the firewall when needed. I always think, rethink, and think again when setting up engine compartments, and like you said, spending some time moving things around to see what and how things may fit best is part of the engineering process.
You are the artiste` and the vehicle is your canvas!
One more further thought if I may? Depending upon how tight your engine mounts will control drivetrain movement, I do also suggest you remove an inch +/- of your solid SS upper radiator hose pipe on each end to allow more rubber hose to take up the flex of chassis / body / engine frame movement. I have made the mistake of running this scenario too tight, not allowing for enough flex and movement, resulting in a stress cracked upper radiator hose inlet. As you know, those types of things always manifest at the worst times, as per Murphy's Law (Chapter 6, section 3).